diff options
Diffstat (limited to 'urt/rle_getrow.c')
| -rw-r--r-- | urt/rle_getrow.c | 203 |
1 files changed, 102 insertions, 101 deletions
diff --git a/urt/rle_getrow.c b/urt/rle_getrow.c index a24870ac..5d71cda7 100644 --- a/urt/rle_getrow.c +++ b/urt/rle_getrow.c @@ -53,13 +53,13 @@ static int debug_f; /* If non-zero, print debug info. */ int -rle_get_setup(rle_hdr * const the_hdr) { +rle_get_setup(rle_hdr * const hdrP) { /*----------------------------------------------------------------------------- Read the initialization information from an RLE file. Inputs: - the_hdr: Contains pointer to the input file. + hdrP: Contains pointer to the input file. Outputs: - the_hdr: Initialized with information from the input file. + hdrP: Initialized with information from the input file. Returns 0 on success, -1 if the file is not an RLE file, @@ -70,19 +70,19 @@ rle_get_setup(rle_hdr * const the_hdr) { infile points to the "magic" number in an RLE file (usually byte 0 in the file). Algorithm: - Read in the setup info and fill in the_hdr. + Read in the setup info and fill in *hdrP. ---------------------------------------------------------------------------- */ struct XtndRsetup setup; short magic; - FILE * infile = the_hdr->rle_file; + FILE * infile = hdrP->rle_file; int i; char * comment_buf; /* Clear old stuff out of the header. */ - rle_hdr_clear(the_hdr); - if (the_hdr->is_init != RLE_INIT_MAGIC) - rle_names(the_hdr, "Urt", "some file", 0); - ++the_hdr->img_num; /* Count images. */ + rle_hdr_clear(hdrP); + if (hdrP->is_init != RLE_INIT_MAGIC) + rle_names(hdrP, "Urt", "some file", 0); + ++hdrP->img_num; /* Count images. */ VAXSHORT(magic, infile); if (feof(infile)) @@ -94,15 +94,15 @@ rle_get_setup(rle_hdr * const the_hdr) { return RLE_EOF; /* Extract information from setup */ - the_hdr->ncolors = setup.h_ncolors; - for (i = 0; i < the_hdr->ncolors; ++i) - RLE_SET_BIT(*the_hdr, i); + hdrP->ncolors = setup.h_ncolors; + for (i = 0; i < hdrP->ncolors; ++i) + RLE_SET_BIT(*hdrP, i); if (!(setup.h_flags & H_NO_BACKGROUND) && setup.h_ncolors > 0) { rle_pixel * bg_color; - MALLOCARRAY(the_hdr->bg_color, setup.h_ncolors); - if (!the_hdr->bg_color) + MALLOCARRAY(hdrP->bg_color, setup.h_ncolors); + if (!hdrP->bg_color) pm_error("Failed to allocation array for %u background colors", setup.h_ncolors); MALLOCARRAY(bg_color, 1 + (setup.h_ncolors / 2) * 2); @@ -111,50 +111,51 @@ rle_get_setup(rle_hdr * const the_hdr) { 1+(setup.h_ncolors / 2) * 2); fread((char *)bg_color, 1, 1 + (setup.h_ncolors / 2) * 2, infile); for (i = 0; i < setup.h_ncolors; ++i) - the_hdr->bg_color[i] = bg_color[i]; + hdrP->bg_color[i] = bg_color[i]; free(bg_color); } else { getc(infile); /* skip filler byte */ - the_hdr->bg_color = NULL; + hdrP->bg_color = NULL; } if (setup.h_flags & H_NO_BACKGROUND) - the_hdr->background = 0; + hdrP->background = 0; else if (setup.h_flags & H_CLEARFIRST) - the_hdr->background = 2; + hdrP->background = 2; else - the_hdr->background = 1; + hdrP->background = 1; if (setup.h_flags & H_ALPHA) { - the_hdr->alpha = 1; - RLE_SET_BIT( *the_hdr, RLE_ALPHA ); + hdrP->alpha = 1; + RLE_SET_BIT( *hdrP, RLE_ALPHA ); } else - the_hdr->alpha = 0; + hdrP->alpha = 0; - the_hdr->xmin = vax_gshort(setup.hc_xpos); - the_hdr->ymin = vax_gshort(setup.hc_ypos); - the_hdr->xmax = the_hdr->xmin + vax_gshort(setup.hc_xlen) - 1; - the_hdr->ymax = the_hdr->ymin + vax_gshort(setup.hc_ylen) - 1; + hdrP->xmin = vax_gshort(setup.hc_xpos); + hdrP->ymin = vax_gshort(setup.hc_ypos); + hdrP->xmax = hdrP->xmin + vax_gshort(setup.hc_xlen) - 1; + hdrP->ymax = hdrP->ymin + vax_gshort(setup.hc_ylen) - 1; - the_hdr->ncmap = setup.h_ncmap; - the_hdr->cmaplen = setup.h_cmaplen; - if (the_hdr->ncmap > 0) { - int const maplen = the_hdr->ncmap * (1 << the_hdr->cmaplen); + hdrP->ncmap = setup.h_ncmap; + hdrP->cmaplen = setup.h_cmaplen; - int i; - char *maptemp; + if (hdrP->ncmap > 0) { + int const maplen = hdrP->ncmap * (1 << hdrP->cmaplen); - MALLOCARRAY(the_hdr->cmap, maplen); + unsigned int i; + unsigned char *maptemp; + + MALLOCARRAY(hdrP->cmap, maplen); MALLOCARRAY(maptemp, 2 * maplen); - if (the_hdr->cmap == NULL || maptemp == NULL) { + if (hdrP->cmap == NULL || maptemp == NULL) { pm_error("Malloc failed for color map of size %d*%d " "in rle_get_setup, reading '%s'", - the_hdr->ncmap, (1 << the_hdr->cmaplen), - the_hdr->file_name ); + hdrP->ncmap, (1 << hdrP->cmaplen), + hdrP->file_name ); return RLE_NO_SPACE; } fread(maptemp, 2, maplen, infile); for (i = 0; i < maplen; ++i) - the_hdr->cmap[i] = vax_gshort(&maptemp[i * 2]); + hdrP->cmap[i] = vax_gshort(&maptemp[i * 2]); free(maptemp); } @@ -171,7 +172,7 @@ rle_get_setup(rle_hdr * const the_hdr) { if (comment_buf == NULL) { pm_error("Malloc failed for comment buffer of size %d " "in rle_get_setup, reading '%s'", - comlen, the_hdr->file_name ); + comlen, hdrP->file_name ); return RLE_NO_SPACE; } fread(comment_buf, 1, evenlen, infile); @@ -181,37 +182,37 @@ rle_get_setup(rle_hdr * const the_hdr) { ++i; ++i; /* extra for NULL pointer at end */ /* Get space to put pointers to comments */ - MALLOCARRAY(the_hdr->comments, i); - if (the_hdr->comments == NULL) { + MALLOCARRAY(hdrP->comments, i); + if (hdrP->comments == NULL) { pm_error("Malloc failed for %d comment pointers " "in rle_get_setup, reading '%s'", - i, the_hdr->file_name ); + i, hdrP->file_name ); return RLE_NO_SPACE; } /* Get pointers to the comments */ - *the_hdr->comments = comment_buf; + *hdrP->comments = comment_buf; for (i = 1, cp = comment_buf + 1; cp < comment_buf + comlen; ++cp) if (*(cp - 1) == '\0') - the_hdr->comments[i++] = cp; - the_hdr->comments[i] = NULL; + hdrP->comments[i++] = cp; + hdrP->comments[i] = NULL; } else - the_hdr->comments = NULL; + hdrP->comments = NULL; } else - the_hdr->comments = NULL; + hdrP->comments = NULL; /* Initialize state for rle_getrow */ - the_hdr->priv.get.scan_y = the_hdr->ymin; - the_hdr->priv.get.vert_skip = 0; - the_hdr->priv.get.is_eof = 0; - the_hdr->priv.get.is_seek = ftell(infile) > 0; + hdrP->priv.get.scan_y = hdrP->ymin; + hdrP->priv.get.vert_skip = 0; + hdrP->priv.get.is_eof = 0; + hdrP->priv.get.is_seek = ftell(infile) > 0; debug_f = 0; if (!feof(infile)) return RLE_SUCCESS; /* success! */ else { - the_hdr->priv.get.is_eof = 1; + hdrP->priv.get.is_eof = 1; return RLE_EOF; } } @@ -219,24 +220,24 @@ rle_get_setup(rle_hdr * const the_hdr) { int -rle_getrow(rle_hdr * const the_hdr, +rle_getrow(rle_hdr * const hdrP, rle_pixel ** const scanline) { /*----------------------------------------------------------------------------- Get a scanline from the input file. Inputs: - the_hdr: Header structure containing information about + hdrP: Header structure containing information about the input file. Outputs: scanline: an array of pointers to the individual color scanlines. Scanline is assumed to have - the_hdr->ncolors pointers to arrays of rle_pixel, - each of which is at least the_hdr->xmax+1 long. + hdrP->ncolors pointers to arrays of rle_pixel, + each of which is at least hdrP->xmax+1 long. Returns the current scanline number. Assumptions: rle_get_setup has already been called. Algorithm: If a vertical skip is being executed, and clear-to-background is - specified (the_hdr->background is true), just set the + specified (hdrP->background is true), just set the scanlines to the background color. If clear-to-background is not set, just increment the scanline number and return. @@ -246,7 +247,7 @@ rle_getrow(rle_hdr * const the_hdr, If ymax is reached (or, somehow, passed), continue reading and discarding input until end of image. ---------------------------------------------------------------------------- */ - FILE * const infile = the_hdr->rle_file; + FILE * const infile = hdrP->rle_file; rle_pixel * scanc; @@ -258,51 +259,51 @@ rle_getrow(rle_hdr * const the_hdr, short word, long_data; char inst[2]; - scan_x = the_hdr->xmin; /* initial value */ - max_x = the_hdr->xmax; /* initial value */ + scan_x = hdrP->xmin; /* initial value */ + max_x = hdrP->xmax; /* initial value */ channel = 0; /* initial value */ /* Clear to background if specified */ - if (the_hdr->background != 1) { - if (the_hdr->alpha && RLE_BIT( *the_hdr, -1)) - memset((char *)scanline[-1] + the_hdr->xmin, 0, - the_hdr->xmax - the_hdr->xmin + 1); - for (nc = 0; nc < the_hdr->ncolors; ++nc) { - if (RLE_BIT( *the_hdr, nc)) { + if (hdrP->background != 1) { + if (hdrP->alpha && RLE_BIT( *hdrP, -1)) + memset((char *)scanline[-1] + hdrP->xmin, 0, + hdrP->xmax - hdrP->xmin + 1); + for (nc = 0; nc < hdrP->ncolors; ++nc) { + if (RLE_BIT( *hdrP, nc)) { /* Unless bg color given explicitly, use 0. */ - if (the_hdr->background != 2 || the_hdr->bg_color[nc] == 0) - memset((char *)scanline[nc] + the_hdr->xmin, 0, - the_hdr->xmax - the_hdr->xmin + 1); + if (hdrP->background != 2 || hdrP->bg_color[nc] == 0) + memset((char *)scanline[nc] + hdrP->xmin, 0, + hdrP->xmax - hdrP->xmin + 1); else - memset((char *)scanline[nc] + the_hdr->xmin, - the_hdr->bg_color[nc], - the_hdr->xmax - the_hdr->xmin + 1); + memset((char *)scanline[nc] + hdrP->xmin, + hdrP->bg_color[nc], + hdrP->xmax - hdrP->xmin + 1); } } } /* If skipping, then just return */ - if (the_hdr->priv.get.vert_skip > 0) { - --the_hdr->priv.get.vert_skip; - ++the_hdr->priv.get.scan_y; - if (the_hdr->priv.get.vert_skip > 0) { - if (the_hdr->priv.get.scan_y >= the_hdr->ymax) { - int const y = the_hdr->priv.get.scan_y; - while (rle_getskip(the_hdr) != 32768) + if (hdrP->priv.get.vert_skip > 0) { + --hdrP->priv.get.vert_skip; + ++hdrP->priv.get.scan_y; + if (hdrP->priv.get.vert_skip > 0) { + if (hdrP->priv.get.scan_y >= hdrP->ymax) { + int const y = hdrP->priv.get.scan_y; + while (rle_getskip(hdrP) != 32768) ; return y; } else - return the_hdr->priv.get.scan_y; + return hdrP->priv.get.scan_y; } } /* If EOF has been encountered, return also */ - if (the_hdr->priv.get.is_eof) - return ++the_hdr->priv.get.scan_y; + if (hdrP->priv.get.is_eof) + return ++hdrP->priv.get.scan_y; /* Otherwise, read and interpret instructions until a skipLines instruction is encountered. */ - if (RLE_BIT(*the_hdr, channel)) + if (RLE_BIT(*hdrP, channel)) scanc = scanline[channel] + scan_x; else scanc = NULL; @@ -310,21 +311,21 @@ rle_getrow(rle_hdr * const the_hdr, inst[0] = getc(infile); inst[1] = getc(infile); if (feof(infile)) { - the_hdr->priv.get.is_eof = 1; + hdrP->priv.get.is_eof = 1; break; /* <--- one of the exits */ } switch(OPCODE(inst)) { case RSkipLinesOp: if (LONGP(inst)) { - VAXSHORT(the_hdr->priv.get.vert_skip, infile); + VAXSHORT(hdrP->priv.get.vert_skip, infile); } else - the_hdr->priv.get.vert_skip = DATUM(inst); + hdrP->priv.get.vert_skip = DATUM(inst); if (debug_f) pm_message("Skip %d Lines (to %d)", - the_hdr->priv.get.vert_skip, - the_hdr->priv.get.scan_y + - the_hdr->priv.get.vert_skip); + hdrP->priv.get.vert_skip, + hdrP->priv.get.scan_y + + hdrP->priv.get.vert_skip); break; /* need to break for() here, too */ @@ -332,8 +333,8 @@ rle_getrow(rle_hdr * const the_hdr, channel = DATUM(inst); /* select color channel */ if (channel == 255) channel = -1; - scan_x = the_hdr->xmin; - if (RLE_BIT(*the_hdr, channel)) + scan_x = hdrP->xmin; + if (RLE_BIT(*hdrP, channel)) scanc = scanline[channel]+scan_x; if (debug_f) pm_message("Set color to %d (reset x to %d)", @@ -362,12 +363,12 @@ rle_getrow(rle_hdr * const the_hdr, nc = DATUM(inst); ++nc; if (debug_f) { - if (RLE_BIT(*the_hdr, channel)) + if (RLE_BIT(*hdrP, channel)) pm_message("Pixel data %d (to %d):", nc, scan_x + nc); else pm_message("Pixel data %d (to %d)", nc, scan_x + nc); } - if (RLE_BIT(*the_hdr, channel)) { + if (RLE_BIT(*hdrP, channel)) { /* Don't fill past end of scanline! */ if (scan_x + nc > max_x) { ns = scan_x + nc - max_x - 1; @@ -380,7 +381,7 @@ rle_getrow(rle_hdr * const the_hdr, if (nc & 0x1) getc(infile); /* throw away odd byte */ } else { - if (the_hdr->priv.get.is_seek) + if (hdrP->priv.get.is_seek) fseek(infile, ((nc + 1) / 2) * 2, 1); else { int ii; @@ -390,7 +391,7 @@ rle_getrow(rle_hdr * const the_hdr, } scanc += nc; scan_x += nc; - if (debug_f && RLE_BIT(*the_hdr, channel)) { + if (debug_f && RLE_BIT(*hdrP, channel)) { rle_pixel * cp; for (cp = scanc - nc; nc > 0; --nc) fprintf(stderr, "%02x", *cp++); @@ -410,7 +411,7 @@ rle_getrow(rle_hdr * const the_hdr, if (debug_f) pm_message("Run length %d (to %d), data %02x", nc, scan_x, word); - if (RLE_BIT(*the_hdr, channel)) { + if (RLE_BIT(*hdrP, channel)) { if (scan_x > max_x) { ns = scan_x - max_x - 1; nc -= ns; @@ -427,28 +428,28 @@ rle_getrow(rle_hdr * const the_hdr, break; case REOFOp: - the_hdr->priv.get.is_eof = 1; + hdrP->priv.get.is_eof = 1; if (debug_f) pm_message("End of Image"); break; default: pm_error("rle_getrow: Unrecognized opcode: %d, reading %s", - inst[0], the_hdr->file_name); + inst[0], hdrP->file_name); } if (OPCODE(inst) == RSkipLinesOp || OPCODE(inst) == REOFOp) break; /* <--- the other loop exit */ } /* If at end, skip the rest of a malformed image. */ - if (the_hdr->priv.get.scan_y >= the_hdr->ymax) { - int const y = the_hdr->priv.get.scan_y; - while (rle_getskip(the_hdr) != 32768 ) + if (hdrP->priv.get.scan_y >= hdrP->ymax) { + int const y = hdrP->priv.get.scan_y; + while (rle_getskip(hdrP) != 32768 ) ; return y; } - return the_hdr->priv.get.scan_y; + return hdrP->priv.get.scan_y; } |